subversion-perlbindings: add perl 5.18 and 5.20 support

[ryandesign (Ryan Carsten Schmidt)]

This patch adds 5.18 and 5.20 to the supported perl versions. I also made an incidental change to a string comparison (use eq instead of == and use curly braces around variable names). Lastly, I changed the default perl version from 5.12 to 5.16 to match the rest of MacPorts.

The 5.18 subport builds for me, but the 5.20 doesn't:

make: *** No rule to make target `install-swig-pl-lib'.  Stop.

Could you investigate and fix? This blocks other updates I'm wanting to commit.

[danielluke (Daniel J. Luke)]

Ryan - I couldn't replicate your build failure with perl5.20, so I committed p5.18 and p5.20 both in r124714.

[ryandesign (Ryan Carsten Schmidt)]

Thanks! Upon trying again, it worked for me as well. It was a destroot failure before, so it can't really have been a parallel build failure. Not sure what that was but glad it's working now.

[jmroot (Joshua Root)]

Surely that replaced_by can go away by now?

[danielluke (Daniel J. Luke)]

Replying to jmr@…:

Surely that replaced_by can go away by now?

only if we want it to no longer mimic the perl5 portgroup (which does something similar for the p5- ports...

            replaced_by p[option perl5.default_branch]-${rootname}
            depends_lib port:p[option perl5.default_branch]-${rootname}